In the article, it says “Professor Essén” +Uppsala
No, this person doesn’t exist, but you found a person they were referring too, that is a good job.
Still doesn’t change the fact that the person described in the article doesn’t exist. It may simply be a poor translation.
In the article, it says "Essén and Professor Emeritus at Uppsala University Sven Kullander."
Just in case you were wondering, here's Kullander's web page.
You will note that, as with Essén, Kullander's credentials check out with what the article says they are.
You're obviously wrong here. Man up and admit it.